Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d843366f902bc8…

MALICIOUS

PDF

40.3 KB Created: 2020-08-12 07:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65587b0a42ae345ab2d168c5adfb4f3a SHA-1: ce160b0964dcc79b89fff774052319e9dd9630d3 SHA-256: 68d843366f902bc8c5060eed8e896365f720fd78d379fb3594853094a67d420c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify, and one critical link redirects to a known malicious domain (ttraff.com). The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to 'Econometrics for dummies pdf' and a URL that appears to be part of the malicious redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=econometrics+for+dummies+pdf
    • http://files.myrawilliamsottewell.com/uploads/1/3/1/4/131408537/2dda0c4825021.pdf
    • http://files.izzyzaino.com/uploads/1/3/1/0/131070722/2383743.pdf
    • http://files.mumsandtums.com/uploads/1/3/1/6/131637631/9451161.pdf
    • http://files.familypracticemidwifery.com/uploads/1/3/1/4/131437733/mujexufakos.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/kinesa.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/gidens_sociologija.pdf
    • https://cdn.shopify.com/s/files/1/0440/2541/3782/files/61379958328.pdf
    • https://cdn.shopify.com/s/files/1/0434/5036/8152/files/81263634730.pdf
    • https://cdn.shopify.com/s/files/1/0429/1448/0287/files/centroide_y_centro_de_gravedad_estatica.pdf
    • https://cdn.shopify.com/s/files/1/0430/6465/6026/files/spybot_search_and_destroy_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/45185528748.pdf
    • https://cdn.shopify.com/s/files/1/0430/9241/0525/files/kojafetasapuvef.pdf
    • https://cdn.shopify.com/s/files/1/0430/5145/0519/files/cmp_blood_test_results_explained.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/31894917349.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9674/files/kolowosagejubibomarojetan.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/10972110305.pdf
    • https://cdn.shopify.com/s/files/1/0451/0469/3400/files/ap_environmental_science_frq_2015.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f1f.bin
5c452e9e94a7c4249340d844ba7a90c0b37215ccb5a25d084cbc0a63f64a926f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1F 5016 bytes
font_01_sfnt_off0000700e.bin
5f20091aef5098f66938053e434189e04c7419f35bb38f72b354256f21475a7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x700E 10672 bytes

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